According to
http://jena.apache.org/documentation/tdb/tdb_transactions.html#multi-threaded-use
only one DataSet connection can be used per Java thread. However, I need
several connections to (different) data models within a single application.
I noticed that if one tries to use several datasets per single-thread then
the application is blocked when trying to create the second dataset. I
tried to overcome the issue by creating a new thread per dataset (just as
recommended in the Jena documentation). However, the problem is still the
same: The second "TDB.createDataset(..)" statement causes the application
to be blocked.
This is my (runnable) test code:
JunitTest:
public static void main(String[] args) {
String dir
= "/Users/andreas_gruenwald/da-agr/resources/design/jena_tdb/itpm_jena";
Runnable tdb1 = new TDBThread(dir, null);
Runnable tdb2 = new TDBThread(dir, null);
tdb1.run();
tdb2.run();
System.out.println("Finished");
}
TDBThread.java:
public class TDBThread implements Runnable {
private Dataset tdbDataSet;
private String directory;
public TDBThread(String directory) {
tdbDataSet = null;
this.directory = directory;
}
@Override
public void run() {
System.out.println(String.format("Run (directory=%s)...", directory));
*tdbDataSet** = TDBFactory.createDataset(directory); //blocks here*
System.out.println("Tdbdataset is now " + tdbDataSet);
tdbDataSet.begin(ReadWrite.WRITE); *//causes block*
}
}
Any ideas what I (or Jena) is doing wrong?
--
Andreas Grünwald
Tel.: +43 650 77 82340
